package com.example.usercenter.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.example.usercenter.common.ErrorCode;
import com.example.usercenter.exception.BusinessException;
import com.example.usercenter.model.domain.User;
import com.example.usercenter.service.UserService;
import com.example.usercenter.mapper.UserMapper;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import static com.example.usercenter.contant.UserConstant.USER_LOGIN_STATE;

/**
* @author REN
* @description 针对表【user(用户表)】的数据库操作Service实现
* @createDate 2025-09-21 10:39:43
*/
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User>
    implements UserService{

    @Resource
    private UserMapper userMapper;

    /**
     *加密盐值
     */
    private static final String SALT = "1234567890";



    @Override
    public long userRegister(String userAccount, String userPassword, String checkPassword) {
        //1.校验
        if(StringUtils.isAnyBlank(userAccount,userPassword,checkPassword)){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"参数为空");
        }
        if(userAccount.length() < 4){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"用户账号太短");
        }
        if(userPassword.length() < 8 || checkPassword.length() < 8){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"密码少于8位");
        }
        //帐户不能包含特殊字符 正则表达式
        String validPattern =  ".*[[ _`~!@#$%^&*()+=|{}':;',\\[\\].<>/?~！@#￥%……&*（）——+|{}【】‘；：”“’。，、？]|\\n|\\r|\\t].*";
        Matcher matcher = Pattern.compile(validPattern).matcher(userAccount);
        if(matcher.find()){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"账号含有特殊字符");
        }
        //校验密码和密码相同
        if(!checkPassword.equals(userPassword)){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"账号密码相同");
        }
        //帐户不能重复
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userAccount", userAccount);
        long count = userMapper.selectCount(queryWrapper);
        if(count > 0){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"账号重复");
        }
        //2.加密
        String encryptPassword = DigestUtils.md5DigestAsHex((SALT + userPassword).getBytes());
        //插入数据
        User user = new User();
        user.setUserAccount(userAccount);
        user.setUserPassword(encryptPassword);
        boolean saveResult = this.save(user);
        if(!saveResult){
            throw new BusinessException(ErrorCode.PARAMS_ERROR);
        }
        return user.getId();
    }

    @Override
    public User userLogin(String userAccount, String userPassword, HttpServletRequest request) {
        //1.校验
        if(StringUtils.isAnyBlank(userAccount,userPassword)){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"账户不存在");
        }
        if(userAccount.length() < 4){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"账户名过短");
        }
        if(userPassword.length() < 8){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"密码过短");
        }
        //帐户不能包含特殊字符 正则表达式
        String validPattern =  ".*[[ _`~!@#$%^&*()+=|{}':;',\\[\\].<>/?~！@#￥%……&*（）——+|{}【】‘；：”“’。，、？]|\\n|\\r|\\t].*";
        Matcher matcher = Pattern.compile(validPattern).matcher(userAccount);
        if(matcher.find()){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"账号含有特殊字符");
        }
        //2.加密
        String encryptPassword = DigestUtils.md5DigestAsHex((SALT + userPassword).getBytes());
        //查询帐户是否存在
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userAccount", userAccount);
        queryWrapper.eq("userPassword", encryptPassword);
        User user = userMapper.selectOne(queryWrapper);//调用Dao层方法，把满足条件的取出来
        if(user == null){
            log.info("user login fail,userAccount cannot match userPassword");
            throw new BusinessException(ErrorCode.PARAMS_ERROR);
        }
        //3.用户脱敏
        User safetyUser = getSafetyUser(user);
        //4.记录用户的登陆态
        request.getSession().setAttribute(USER_LOGIN_STATE,safetyUser);
        return safetyUser;
    }

    @Override
    public User getSafetyUser(User originUser){
        if(originUser == null){
            return null;
        }
        User safetyUser = new User();
        safetyUser.setId(originUser.getId());
        safetyUser.setUsername(originUser.getUsername());
        safetyUser.setUserAccount(originUser.getUserAccount());
        safetyUser.setAvatarUrl(originUser.getAvatarUrl());
        safetyUser.setGender(originUser.getGender());
        safetyUser.setPhone(originUser.getPhone());
        safetyUser.setEmail(originUser.getEmail());
        safetyUser.setUserRole(originUser.getUserRole());
        safetyUser.setUserStatus(originUser.getUserStatus());
        safetyUser.setCreateTime(originUser.getCreateTime());
        return safetyUser;
    }

    /**
     * 用户退出登录
     * @param request
     * @return
     */
    @Override
    public int userLogout(HttpServletRequest request){
        request.getSession().removeAttribute(USER_LOGIN_STATE);
        return 1;
    }

}




